+ * fixed bug: initialization of condition class metaobjects no longer
+ causes an instance of the condition to be created. (reported by
+ Marco Baringer)
+ * fixed bug: it is now possible to have slots such that
+ SB-MOP:SLOT-DEFINITION-ALLOCATION of the effective slot
+ description is neither :INSTANCE nor :CLASS.
+ * fixed bug: the ctor optimization of MAKE-INSTANCE now respects
+ user-defined methods on SLOT-BOUNDP-USING-CLASS and (SETF
+ SLOT-VALUE-USING-CLASS), and no longer causes errors with
+ non-standard SLOT-DEFINITION-ALLOCATION values.
+ * optimization: improved performance of BIT and SBIT on bit-vectors.